Structure II, the Great Pyramid at the Mayan ruins of Calakmul, Campeche, Mexico. This is the most massive pyramid bult by the ancient Maya. Calakmul is located in the 7,231.85 square km Calakmul Biosphere Reserve, which was established in 1989. Calakmul was made a UNESCO World Heritage Site in 2002.
Copyright John Mitchell
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